Table 1. Visibility.
| Structure | Without Endoscope | 0 Degree | 30 Degree |
|---|---|---|---|
| Basilar | 12.395 mm | 19.618 mm | 22.526 mm |
| Posterior cerebral artery | 17.042 mm | 22.613 mm | 24.309 mm |
| Ipsilateral third nerve | 100% seen | 100% seen | 100% seen |
| Contralateral third nerve | 0% seen | 100% seen | 100% seen |
| Mammillary bodies | 0% seen | 100% seen | 100% seen |
| Posterior perforated substance | 0% seen | 62.5% seen | 87.5% seen |
| Ipsilateral superior cerebellar artery | 50% seen | 87.5% seen | 100% seen |
| Contralateral superior cerebellar artery | 37.5% seen | 87.5% seen | 100% seen |